Thomas Aquinas

Consequently, when he says, "Take hold of arms," he explains his petition. For he asked for two things: namely the condemnation of those who harm, and the routing of those who attack. And therefore he explains these two in particular. First, he explains the second. Second, the first, at "let them be confounded." Regarding the first, he sets forth five things that are necessary in a defender. The first is that he arm himself; and this he touches upon saying, "Take hold of arms and shield." The arms of God are his elect: Rom. …

Exposition on the Psalms of David ↗

Bonaventure

Since Scripture conceals a manifold understanding beneath a single letter, the expositor ought to bring hidden things forth into the light and make manifest what has been drawn forth through another, more open passage of Scripture, as if I were to expound that verse of the Psalm: Take hold of arms and shield, and rise up to help me, and wished to explain what the divine arms are; I would say that they are his truth and good will: and that this is so must be proved through open Scripture. …

Breviloquium, Prologue ↗